| Joseph-Adéodat Blanchette | |
| Smallimage: | Joseph-Adéodat Blanchette.jpg |
| Constituency Mp: | Compton (1935-1949) Compton—Frontenac (1949-1958) |
| Parliament: | Canadian |
| Predecessor: | Samuel Gobeil |
| Successor: | George Stearns |
| Term Start: | 1935 |
| Term End: | 1958 |
| Birth Date: | August 7, 1893 |
| Birth Place: | Acton Vale, Quebec, Canada |
| Death Place: | Quebec, Canada |
| Nationality: | Canadian |
| Party: | Liberal Party |
| Occupation: | merchant |
Joseph-Adéodat Blanchette (August 7, 1893 – November 14, 1968) was a Canadian politician and merchant. He was elected to the House of Commons of Canada as a Member of the Liberal Party to represent the riding of Compton. During his time in parliament, he was the Chief Government Whip's assistant and Deputy Whip of the Liberal Party. He later became the Parliamentary Assistant to the Minister of National Defence followed by Parliamentary Assistant to the Minister of Labour.